SERVICE BRAKES ON ALL AXLES DO NOT APPLY OR APPLY SLOWLY.

TM 9-2330-385-14

4-16. BRAKE SYSTEM TROUBLESHOOTING PROCEDURES (CONT).

5. SERVICE BRAKES ON ALL AXLES DO NOT APPLY OR APPLY SLOWLY.

INITIAL SETUP

Tools and Special Tools

References

Tool Kit, General Mechanic's: Automotive

TM 9-2320-364-10

(Item 50, Appendix J)

Equipment Condition

Pressure Test Kit (Item 34, Appendix J)

Engine OFF, (TM 9-2320-364-10)

Materials/Parts

Parking brake applied, (TM 9-2320-364-10)

Solution, Soap (Item 21, Appendix E)

Wheels chocked, (TM 9-2320-364-10)

Emergency and service air supply gladhand

Personnel Required

connected to truck, (Para 2-22)

Two

Trailer air system charged, (Para 2-22)

NOTE

Soap and water solution will be used to visually check for leaks.

START

KNOWN INFO

TEST OPTIONS

Visual inspection.

Are air lines 2255, 2260, 2637,

Truck air system OK.

Audible inspection.

2638, 2639, 2660, fittings, load

sensing valve and quick

POSSIBLE PROBLEMS

REASON FOR QUESTION

release valve free of leaks and

Air lines and fittings faulty.

crimps?

If air lines or components listed

Load sensing valve faulty.

leak, loss of air pressure will

Quick release valve faulty.

prevent application of service

brakes. Crimped air lines will

also restrict air flow to brake

chambers.

Tighten loose fittings,

repair or replace air

lines, and/or replace

components (Para

4-47. Verify repair, go

to Step 4 of this Fault.

YES

4-272